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Finding the Fourth Proportional to 388.16, 579.38 and 355.69

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Solution

The fourth proportional to 388.16, 579.38 and 355.69 is: 530.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.16 : 579.38 = 355.69 : x
  2. Step 2: Convert to fraction form
    388.16/579.38 = 355.69/x
  3. Step 3: Cross multiply
    388.16x = 579.38 × 355.69
  4. Step 4: Simplify right side
    388.16x = 206,075.89
  5. Step 5: Solve for x
    x = 206,075.89/388.16
  6. Step 6: Final answer
    x = 530.90

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.